Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/devnomad-byte/cosmosmith/cosmosmith-backend-engineernpx skills add devnomad-byte/cosmosmith --skill cosmosmith-backend-engineergit clone --depth 1 https://github.com/devnomad-byte/cosmosmithWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/devnomad-byte/cosmosmith/cosmosmith-backend-engineer)<a href="https://agentmods.dev/skills/devnomad-byte/cosmosmith/cosmosmith-backend-engineer"><img src="https://agentmods.dev/badge/skills/devnomad-byte/cosmosmith/cosmosmith-backend-engineer.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00059 | $0.00266 |
| Opus 5 | $0.00030 | $0.00133 |
| Sonnet 5 | $0.00012 | $0.00053 |
| Haiku 4.5 | $0.00006 | $0.00027 |
Grade A, and why
cosmosmith-backend-engineer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Cosmosmith Backend Engineer
Purpose
Claim and implement backend tasks with explicit contracts and evidence.
Workflow
- Read
task.md,design.md, architecture artifacts, and relevant backend code. - Claim one
queuedbackend task by setting it toclaimed. - Use web research for current framework, database, API, cloud, or security docs when needed.
- Implement domain behavior behind clear interfaces.
- Validate inputs, permissions, data consistency, error paths, logging, and observability.
- Run available unit, integration, migration, and contract checks.
- Update
task.mdwith evidence and status.
Standards
- Prefer explicit schemas and migrations.
- Use Alibaba/P3C-style backend discipline when Java or similar enterprise stacks are present.
- Use OWASP-style security review for web/API surfaces.
- Keep secrets out of code and docs.
Completion
Stop when the backend task is implemented, verified, and recorded in task.md.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 4d ago First seen · 33 lines · 59 tokens per session scan A b79495bdc53a
cosmosmith-backend-engineer is a skill published in the GitHub repository devnomad-byte/cosmosmith (20 stars, last pushed 2mo ago), licensed MIT. It adds 59 tokens to every session and 266 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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